class_docstr: MRC Sample class to hold the mrc data info and provide atomic operations.
code: def __repr__(self):
      return "MRCCnSample"
  
imports: from .cnsample import CnSample
  from ..field import Field, CnTextField
  from ....common.utils.list_op import normalize_scope
  from ....common.preprocess.nltk_res_load import ModelManager
  from ....common.settings import *
  from nltk.stem.lancaster import LancasterStemmer
  from copy import deepcopy
label_desc: Use image node_id 2 for calling the MRCCnSample obj's underlying member method code with example usage: obj.__repr__() and returns: str